Treatment of spinning cakes



Dec. 12, 1933. Q HERRMANN 1,938,830

TREATMENT OF SPINNING CAKES Filed Jan. 31, 1931 Eiqil- J I z 10/ iAM L J'oazmdfiermawz Patented Dec. 12, 1933 UNITED STATES PATENT OFFICE TREATMENT OF SPINNING CAKES Delaware Application January 31,

1931, Serial No. 512,572,

and in Germany February 6, 1930 2 Claims.

This process concerns the washing and subsequent treatment of spinning cakes spun according to the pot spinning process, as used in the viscose and cuprammonium rayon industries.

According to my invention, the treating solutions such as'washing water or desulphurizing baths, bleaching baths, deacidifying baths, avivage baths, etc., are passed through the thread in a radial direction.

For this purpose a perforated tube or' pipe is used through which the treating liquids can be admitted and emitted, and which is perforated for the length of the cake. The tube above the cake is closed to the liquids surrounding the cake. The two ends of the cake are protected against the free entry of the treating solutions.

The penetration of the washing solutions through the cake body can be effected by means of hydrostatic pressure, which may operate from the go inside to the outside or preferably from the outside to the inside.

In order to apply this process the various spinning cakes are covered with transparent or netlike covers. For this purpose hoselike covers made of rayon or mixed textile fabrics may be used. These may be inserted in the aperture in the spinning cakes and the extending ends of the covers may be stretched and folded back to receive the cake, the outside ends being trucked into the aperture in the cake. By treating the spinning cakes in this manner it has been found that a comparatively small pressure can be used because at a greater pressure the'structure of the cake may become loose and the Water may pass unused. It is recommended that a pressure above 0.1 atmospheric be notused. .This may be accomplished by regulating the inner pressure so that the level of the solution will not be much higher than the upper rim of the cake where the water level can be kept constant by using an overflow valve or by regulating it,

by means of a float.

In order to clearly describe my new process, I have prepared the accompanying drawing, in which:

Figure 1 is an elevational view, in cross-section, of my device, and

Figure 2 is a top plan view of the same. The arrangement of this process consists of a treatment box (2) on the bottom of which are a. number of vertically-placed tubes (1) which are sealed. The tubes or pipes are placed at a suitable distance from each other so that the cakes (5) may be pulled over the tubes; The tubes go through the bottom of the box and are open on the bottom or are provided at least with an outflow for the treating solutions. The various spinning cakes (5) suitably covered can be pulled over the tubes if there is left sufficient play. Between the bottom surface and the lower front surface of the cake a cuff-like gasket (6) is pulled over the tube. A similar cuff-like gasket (7) is placed on the cake, and, in order to obtain a good seal, the upper gasket is loaded with a ring (8). These packing rings must be placed in such a way that they also seal the inner tube (1). The inner tube may be suitably guarded at its upper end against outside treating solutions by keeping it 'above the Waterlevel.

The treating liquids are introduced through the inlet (9) while the overflow (10) (which may be formed as a lever), and the outlet (11) care for the overflow. The collection box which cares for the liquid issuing from (11) is indicated at (12).

The materials to be used for the box as well as for the other connections, the perforated tube and other parts should of course be resistent to the influence of the treating solutions.

If the treatments consist of washing, deacidifying, bleaching, avivage, desulphurizing with neutral or acid containing liquids, aluminum may be used without difficulty, and, for the box, even wood may be employed. For the packing rings it is recommended that soft rubber, felt or similar material be used which is sufficiently resistant and elastic and which at thesame time produces a good seal.

Having now set forth my invention as required by the patent statutes, what Idesire to claim is:

1. In a process for washing and otherwise treating spinning cakes the steps of wrapping the cakes in a net-like covering, placing them about a hollow perforated tube under compression, and passing treating liquors through the wrapped cakes and the tubes by using a differential pressure of less than about one-tenth of an atmosphere.

2. In a process for wet-treating and annular netted mass of artificial filaments, the step of passing fluid through the mass in a generally radial direction and under a differential pressure of about one-tenth of an atmosphere while maintaining the mass under compression.

CONRAD HERRMANN. 

